William a



(No Model.) f

A W. A. TURNER.

A SHEET METAL-KNOB. Y No. 511,178. i Y Patented Deo; v19, 1893.

Witwen@ v Syvum/1oz 351,71 @U11-cambia my invention.

UNITED STATES PATENT trios.

` -WILLIAH A. TURNER., 0F YVORCESTER, MASSACHUSETTS, ASSlGNOR TO EDMUND CONVERSE, OF SAME PLAGE.

VSHEET-METAL KNOB.

SPECXFIGATION forming part of Letters Patent No. 511,178, dated December 19, 1893. Application and December 20,1890. serrano. 375,297. memorie.)

To all whom it may concern:

Be it known that l, YILLIAM A. TURNER, a citizen of the United States, and a resident ot llorcester, in the county ot Worcester and State of Massachusetts, have invented certain new and useful Improvements in Sheet- Metal Knobs, of which the following is a specication.

My invention relates primarily to that class of knobs used for damper-s or registers, but it also embodies certain features which are equally applicable to sheet metal knobs used for other purposes.

i Referring to accompanying drawings, Figure l, represents a damper knob connected with a sliding register plate and embodying Fig. 2, is a vertical sectional v iew of the same. Fig. 3,`is a central sectional view of the base. Fig. e, is a detached vlew of the attaching bolt and connected parts, and Fig. 5, is a central sectional vieuT of a sheet metal knob embodying so much of my invention as relates to the use ofl the disk C, the spring E, and Washer D, having been omitted, with the attaching bolt passing through a concentric opening in the closed end of the knob.

Similar letters refer to similar parts in the dierent gures. Y

lihave represented in Figs. 1, and 2, an elevation and sectional view ot' a damper or register knob, which is shown as applied to a sliding damper or register plate. The body of the knob consists of a crown section A, and a base section B, which are united together by turning the flanged edge of the crown section over the upper or larger end of the base section in the usual manner of manufacturing this class of knobs. Resting upon the larger end of the base B, is a disk C, provided with a central screw threaded hole for the bolt U2, by which the knob is attached to the damper or register. The smaller end of the base B, is left entirely open as represented at B', in Figs. 2, and 3, and inclosed Within the smaller end of the base is a cup shaped Washer D, having a central opening through which the attaching bolt C2, passes. Between the cup` shaped washer D, and the disk C, and surrounding the attaching bolt C2, is a spiral spring E, whose tension serves to force the cup shaped Washer D, out of the base B, until it is caught by the head C3, of the attaching bolt C2. The sides of the cup shaped Washer D, are therefore made higher than the distance between the smaller and open end of the base B, and the head C3. In applying the knob to a register the cup shaped Washer D, rests upon the stove plate G, and the attaching bolt C2, is passed through a hole in the sliding register plate H, and through the cup shaped washer D, and a spiral spring E, and is screwed into the disk C, compressing the spring E, and pushing the cup shaped Washer D, into the base B, thereby increasing the tension of the spring E, and holding the sliding register plate lil, against the plate G. The amount of compression of the spring E, can readily be determined by observing the distance which the cup shaped Washer D, projects out of the open end of the base B, and the compression ot the spring is limited by the contact of the open end B', of the base B, with the plate Gr. rlhe base B, is provided with ventilating holes l, to allow free circulation of air through the interior of the knob and prevent the undue heating of the spring E. lf for any reason the elasticity of the spring E, becomes lost the attaching bolt C2, can be Withdrawn allowing the Washer D, and spring E, to be removed and a new spring insered. The att-aching bolt C2, is made to till the hole in the center ot' the cup shaped Washer D, and the cup shaped washer D, is made to ll the open end B', ot' the base B, so as to prevent any lateral movement of the knob upon the bolt C2, and securing two independent bearings of the knob upon its attaching bolt namely: at the smaller end of the base B, and at the center of the disk C, l

the knob being attached to the register plates by means of the bolt C2, and disk C, While its lower end is held from lateral movement by means of the cup shaped Washer D. 'The knob by this means of attachment is enabled to withstand a lateral strain upon the n base B, and the base B, is provided with a closed bottom N having a central hole J, through which the attaching bolt C2, passes Y having a screw threaded section screwing in to the center of the disk C,andthereby drawing the knob firmly against the plate K.

In Figs. 2 and 5 the disk C, is'held from longitudinal movement within the knob by means of the edge of the diskrresting upon the larger end of the base B, and being held in contact therewith by a bead O, in the crown A. The disk C, is of the same dialneter as the outsidediameterof thelarger end of the base section B, of the knob and in uniting the crown section A, with the base section B, the edge of the crown section A, is turned over the edge of the disk C, and the larger end of the base section B, thereby uniting the crown section A, base section B, and disk C, together in one completed knob by a single operation, the diameter of the disk C, and the outer diameter of the larger end of Y the base section B, being the same, the presence of the disk C, facilitates the operation of uniting the crown and base sections in the manner described and the strain exerted by the attaching bolt is received upon the larger end of the base section B, in the plane of the largest diameter of the knob, so that the the plate K, in Fig. 5, is exerted upon the an- Y nular edge ofthe base section B,and parallel with the axis of the attaching bolt.

fhat I claim as my invention, and desire to secure by Letters Patent, is-

l. In a sheet metal knob, the combination with abase andacrown section united together to form the body of the knob, of a disk held from longitudinal movement within the body ofV the knob and a screw threaded bolt passing through the end of the base section of the knob and engaging' a concentric opening in said disk, substantially as described.

2. In a sheet metal knob the combination of the flaring or bell-shaped base section B, a circular disk C, having a concentric screw threaded hole and resting upon the edge of the larger end of said base section B,a crown section A, united to said base section by its edge, whereby said disk is securely locked between said base and said crown sections and heid from longitudinal movement, a washer D, held in the smaller end ot' said base section, a spiral spring E, interposed between said disk and Vsaid washer, with its tension applied to force said Washer out ot the base section and an attaching bolt passing concentrically through said Washer and said spring and engaging the screw threaded concentric hole in said disk, substantially as described.

Dated at Vorcester, in the county ot' Worcester and State of Massachusetts, this V18th day of December, 1890.

WILLIAM A. TURNER. XVitiiesses:

RUFUs B. FoWLER, E. CONVERSE. 

